Hello, I'm looking to upgrade my graphics card in my inspiron 660, motherboard model 0XR1GT and was looking at Nvidia GeForce GTX 650 TI http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-650ti/specifications
Not entirely sure on an ideal PSU model to buy but I'm looking for around a 500W PSU preferably no more than $40.
First off: Never, ever buy a cheap power supply. You're just begging for fried components and fireworks if you do. I know this from first hand experience.
Second: The 650 Ti is a great card, but if you're just getting a reference card go for the 750 Ti. Lower power consumption and better performance.
Which is a bit too much for what you plan on getting, but I'm just trying to put it into perspective. I'm sure a PSU expert will pop up here, they know what they're talking about